Hi Wouter, we have three version of Mattia Esse: a first (in the page of the site sailnr 541) produced from 1978 to 1991. The second (production 1992 - 2003) sail ns 853 and the actual Mattia Esse sport, from 2003. We produced over 80 boats (40 in Italy . 40 in France. This version fit the 1.04 rating and is a totally renewed boat (new hulls, sailplan, beams, etc.)At the Italian champonship 2007 we were 27 boats, at Eurocup 2007 22 (19 Ita + 3 Fra).